Muffler for explosive engines



May 26, 1925.

' H. s. POWELL MUFFLER FOR EXPLOSIVE ENGINES Filed Oct. 10, 1921 IN VEN TOR /W%w M I I'IIIIIIII IIIIIIIII||.|I

fax/M4 A TTORNEY ness to said partitions .by to prevent t Patented May 26 1925.

UNITED STATES nimnnar srnucna POWELL, or New marroan, NEW YORK.

IUFFLEB FOB EXPLOSIVE ENGINES.

Application fled October 10, 1921. Serial F0. 508,590.

To all whom it may concern:

Be it known that I, HERBERT SPENCER POWELL, a citizen of the United States, residin at New Hartford, in the county of Onei a and State of New York, have invented certain new and useful Improvements in Mufllers for Explosive Engines, of which the following is a specification, reference being had therein to the accompanying drawliy invention relates to a mufiier for explosive en 'nes, and I declare the following to be a ful clear; concise, and exact description. thereof sufiicient to enable an one skilled in the art to which it appertams to make and use the same, reference bein had to the accompanying drawings in whic like reference characters refer to like parts throughout the specification.

The object of the invention is to provide a muilier for explosive engines that is constructed not only with the idea of breaking up the explosive charge as it comes from the on he cy inders before it reaches the outsi e atmosphere but also with the idea of strengthening and stiffening the partitions that form baflle lates in the muflier wherelie vibration of said bafile plates and, thereby, increase the efliciency of the mufiler in reducing the sound of the ex haust ases as they come to the atmos here. To t is end the mufiier has a plurality of like sections forming chambers with parti-X tions therein havin apertures so located as to break up the exp osive charge, as it comes from the engine 0 linder before it reaches the outside atmosp ere.

Moreover, the partitions, which form baflie plates and undergo considerable strain are perforated with holes for the passage of the exhaust. They are shown here strengthened or stiffened in a novel manner, whereby to prevent vibration by the aid of annular walls or elon ated corrugations that are drawn or punche at right angles to the surface of the 'artitions and about the several apertures ormed in each partition therein. Such walls will lend not onl strength and stiffhut also, will extend the metallic surface to aid in the diffusion of heat.

. The object will appear by referring to the drawings in which: Fig. 1 is a central vertical section of a mufiler, showing the novel annular walls or of cu s 1 can take corrugations about the several apertures of each partition or bafile plate;

Ijig. 2 is an enlarged perspective view of a single cup employed in the construction of the muiller; i

Fig. 3 is an enlarged detail view,showing a vertical central section of a modified manner of constructing the muflier, parts being broken away;

Fig. 4 is an enlar ed detail view, showing a vertical section 0 the wall of a partition or bafile plate adjacent an aperture, that is employed in the construction of themufiier.

Referring more particularl to the drawings, the muffler is formed with a plurality of cups 1 thatprovide chambersvfor the assage of the exhaust ases of explosion. he annular walls of eac of the cups 1 are flared out a little at the outer or o en ends, as at 2, whereby to form a seat or the ed e of the next adjacent cup --1. The en s of the mufiler are closed by the flanged heads 3 and 4. Head 3 has a threaded openin for the attachment of the inlet pipe 5 and ead 4 a threaded opening for the, attachment of the outlet pipe 6.

The several parts including the cups 1 and heads 3 and 4 are bound together by means of stay rods 7, 7 that-pass longitudinally through suitable apertures 14 made in the several cups stay rods pass being sufiiciently large so that cups 1 will not make contact with stay rods 7, whereby expansion and contraction lace without bending rods There are a so apertures made in heads 3 and 4 for the passage of sta rods 7. The rods 7 are located diametrica ly opposite each other.

The products of the exhaust gases are re- 1 apertures .14 through which ceived and disbursed to some extent through the first two chambers which have a single large central aperture 12, in each instance to form an expansion'chamber. Said a erture12 is formed in the partition an is surrounded by a wall or corrugation 13 that is formed by pressing or drawing the metal through said artition and .at right an. les to the 'plane 0 the adjacent partition. aid gases are received and disbursed to a still greater extent in the successive chambers each of which has a partition wall forming a bafiie plate and in which baffle plate is formed aplurality of small apertures 14 that are disposed in two or more concentric circles about the surface of said baflie plate. The battle plate adjacent each of the small apertures 14 isformed with an annular wall or corrugation 13 as above with respect to apertures 12.

In operation, the exhaust gases pass throu h the muffler in the direction indicated y the arrows in Fig. 1. The exhaust is difi'used to some extent as it passes through the first two chambers of the muflier and to a still greater extent as it passes through the remaining chambers, where the apertures, though smaller, are more numerous and more widely scattered.

Ihe walls or corrugations 13 surrounding each of the apertures 12 and 14 will strengthen and stifien the several partitions or bafiie plates to such an extent that they will stand up under considerable strain and, thereby, prevent vibration thereof, whereby to prolong the life and efiiciency of the muffler, as well as efi'ect a more complete muflling of the sound that the exhaust gases make on reaching the outside atmosphere. Said wall 25.01 corrugations 13 will provide a more extended metallic surface for exposure, which will aid also in the diffusion of heat, whereby to render the mufiier less subject to the harmful efiects of overheating.

The modification shown in Fig. 3 embodies baflie plates 20 constructed with annular flanges 21 that are adapted to be spot welded to the inside of a hollow cylindrical casing 22, whereby toform a mufiler. The bafile plates are equipped with apertures 23 and the walls of said bafile plates 20 are corrugated, as at 24, about each of said apertures 23, whereby to strengthen the bafiie plates 20, and to provide a more extended surface for the diffusion of heat.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a mufiier for explosive engines, a plurality of sections forming chambers, said sections having their outer edges flared, whereby to nest said sections with relation to each other, said sections having partition walls, the first two partition walls havin large central apertures surrounded wit walls extending in the direction of flow of the gases for forming an expansion chamber and to aid in diffusing the heat, the remaining partition walls having smaller apertures surrounded with walls extending in the direction of flow of the gases to aid also in diffusing the heat of said gases, and stay rods for holding said sections together.

2. In a mufller for explosive engines a plurality of sections forming chambers, said sections having their outer edges flared, whereby to nest said sections with relation to each other, said sections having partition walls, the first two partition walls having large apertures surrounded with walls extending in the direction of flow of the gases to aid in diffusing the heat, the remaining partition walls having smaller apertures surrounded with walls extending in the direction of flow of the gases to aid also in diffusing the heat of said gases, and stay rods for holding said sections together, and the apertures in said sections being sufficiently large to permit the projection of said stay rods, whereby said stay rods will not make contact with said sections and thereby permit of the expansion and contraction of said sections without bendin said stay rods.

In testimony whereo I have ailixed my signature..

HERBERT SPENCER POWELL. 

